Method for producing ultra-fine LiFePO4/C of lithium ion battery anode material
A lithium-ion battery and cathode material technology, applied in the field of energy materials and new material preparation, can solve the problems of large crystal grains, poor electrochemical performance at high currents, large particles, etc., achieve large specific surface area, simple process flow, and good electrical conductivity sexual effect
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[0024] A kind of lithium-ion battery cathode material provided by the invention has high conductivity ultra-fine LiFePO 4 The preparation method of / C, its concrete processing steps are as follows:
[0025] 1) Fe(NO3 ) 3 9H 2 O or Fe 2 (SO 4 ) 3 9H 2 O as the raw material, dissolved in deionized water under stirring conditions to prepare a 1-2mol / L solution, and then added LiFePO 4 The product mass percentage is 1~5% ultra-fine conductive carbon black, obtains Fe 3+ Mixed suspension solution with conductive carbon black;
[0026] 2) Under stirring conditions, slowly drop ammonia water with a molar concentration of 2 to 8 mol / L into the mixed solution prepared in step 1), stop adding ammonia water when the pH value of the solution reaches 8.5 to 9.5, and continue the reaction to make it conductive Carbon black and Fe 3+ When the precipitation is complete, stop stirring;
[0027] 3) The precipitate obtained in step 2) is centrifuged, washed with deionized water, and dr...
Embodiment 1
[0040] Prepare an aqueous ferric nitrate solution with a concentration of 2 mol / L, and add LiFePO 4 The product mass percentage is 2% ultra-fine conductive carbon black; under the condition of stirring, the ammonia water with a molar concentration of 4mol / L is slowly input into the mixed solution of ferric nitrate and conductive carbon black with a metering pump until the pH value of the solution reaches 9.0 Stop dripping ammoniacal liquor, continue to react and stop stirring after 10 minutes, make conductive carbon black and Fe 3+ Precipitate completely; use a centrifuge for solid-liquid separation, and wash with deionized water for 3 times; dry the washed product in a drying oven at 80°C to obtain carbon-doped iron hydroxide; Heat treatment for 6 hours to obtain ultrafine Fe 2 o 3 / C precursor; weigh 3.26g of the above Fe 2 o 3 / C precursor, 1.48g Li 2 CO 3 , 4.61g85%H 3 PO 4 , 1.36g sucrose, and measure 5mL of deionized water, put it in a ball mill and stop for 3 ho...
Embodiment 2
[0042] Prepare an aqueous ferric sulfate solution with a concentration of 1 mol / L, and add LiFePO 4 The product mass percentage is 1% superfine conductive carbon black; under the condition of stirring, use a metering pump to slowly input ammonia water with a molar concentration of 2mol / L into the mixed solution of ferric sulfate and conductive carbon black until the pH value of the solution reaches 8.5 Stop dripping ammoniacal liquor, stop stirring after continuing reaction 15 minutes, make conductive carbon black and Fe 3+ Completely precipitate; use a centrifuge for solid-liquid separation, and wash with deionized water for 4 times; dry the washed product in a drying oven at 80°C to obtain carbon-doped iron hydroxide; then in a nitrogen atmosphere at 400°C Heat treatment for 8 hours to obtain ultrafine Fe 2 o 3 / C precursor; weigh 3.26g of the above Fe 2 o 3 / C precursor, 1.48g Li 2 CO 3 , 4.61g85%H 3 PO 4 , 1.38g sucrose, and measure 5mL of deionized water, put it i...
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